/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineUserInterface.h
Obtains the cached list of online user info
true if user info was found
bool GetAllUserInfo ( int32 LocalUserNum, [TArray](API\Runtime\Core\Containers\TArray)< [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< class [FOnlineUser](API\Plugins\OnlineSubsystem\FOnlineUser) > > & OutUsers )